CN104181759A - Light sensing system and projector using same - Google Patents
Light sensing system and projector using same Download PDFInfo
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- CN104181759A CN104181759A CN201410365897.8A CN201410365897A CN104181759A CN 104181759 A CN104181759 A CN 104181759A CN 201410365897 A CN201410365897 A CN 201410365897A CN 104181759 A CN104181759 A CN 104181759A
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Abstract
The invention provides a light sensing system and a projector using the same. The light sensing system comprises a light sensing unit, a current and voltage conversion unit, a resistance variable module and a control unit, wherein the light sensing unit senses ambient light and generates a current, the current and voltage conversion unit is connected with the light sensing unit and converts the current to a voltage, and the control unit is connected to the current and voltage conversion unit, receives the voltage output by the current and voltage conversion unit, and adjusts the resistance of the resistance variable module according to the output voltage. Thus, the light sensing capability of the system is improved, and the precision of photo-electro-mechanical integration is improved.
Description
Technical field
The present invention relates to projector field, relate in particular to a kind of light sensing system and apply the projector of this light sensing system.
Background technology
Structure as shown in Figure 1 for the existing a kind of Photosensing Units internal integrated circuit (Integrated circuit) that is applied in projector system, this integrated circuit comprises light sensing unit 1a and current/voltage converting unit 2a, this light sensing unit 1a sense ambient light generation current, this current/voltage converting unit 2a connects this light sensing unit 1a and current conversion is become to voltage, calculates colour wheel velocity of rotation by the variation of detecting output voltage V out.Wherein, this Photosensing Units is integrated light sensitive diode D1, operational amplifier 3a and resistance R, the negative pole of light sensitive diode D1 is connected in the inverting input a of operational amplifier 3a, the plus earth of light sensitive diode D1, resistance R is connected between the inverting input a and output terminal c of operational amplifier 3a, the normal phase input end b ground connection of operational amplifier 3a, capacitor C 1 play pressure stabilization function in parallel with resistance R.Light sensitive diode D1 is subject to specific wavelength light source effect generation current, and electric current produces output voltage via supply voltage converting unit 2a, and therefore the light source of different wave length and varying strength can produce corresponding output voltage.
But the resistance R of the supply voltage converting unit 2a in this Photosensing Units is definite value, therefore when arriving, light intensity to a certain degree can make supply voltage converting unit 2a output voltage saturated and cannot distinguish the light source that brightness is stronger, and this light sensing integrated component volume is difficult for reduction, therefore in the time that integrating, projector ray machine need larger space to place, corresponding more accurate optical engine system design restriction to some extent.
Therefore, be necessary to design a kind of novel light sensing system and projector, to overcome above-mentioned defect.
Summary of the invention
The object of the present invention is to provide a kind of light sensing system and projector, it can improve light sensing ability, and improves Light Electrical and integrate precision.
For achieving the above object, the invention provides a kind of light sensing system, this light sensing system comprises light sensing unit and current/voltage converting unit, this light sensing unit sense ambient light generation current, this current/voltage converting unit connects this light sensing unit and current conversion is become to voltage, this current/voltage converting unit comprises variable resistor module, and this light sensing system also comprises:
Control module, is connected in this current/voltage converting unit;
Wherein, this control module receives the output voltage of this current/voltage converting unit, and this control module regulates the resistance of variable resistor module according to this output voltage.
Preferably, this control module one first predeterminated voltage that prestores, this control module receives the first voltage of this current/voltage converting unit output terminal, and in the time that this first voltage is equal to or greater than this first predeterminated voltage, this control module reduces the resistance of variable resistor module.
Preferably, the prestore maximum output voltage of this current/voltage converting unit of this control module, this control module receives the first voltage of this current/voltage converting unit output terminal, and in the time that this first voltage equals this maximum output voltage, this control module reduces the resistance of variable resistor module.
Preferably, this current/voltage converting unit also comprises operational amplifier, and the inverting input of this operational amplifier connects this light sensing unit, and this variable resistor module is connected between the inverting input of this operational amplifier and the output terminal of this operational amplifier.
Preferably, this light sensing unit comprises light sensitive diode, and the negative pole of this photosensitive diode is connected in the inverting input of this operational amplifier, its plus earth.
Preferably, this light sensing unit comprises light sensitive diode, and the negative pole of this photosensitive diode is connected in the inverting input of this operational amplifier, and its positive pole is optionally connected in the normal phase input end of this operational amplifier.
Preferably, this control module connects the normal phase input end of this operational amplifier, for changing operational amplifier bias voltage.
For achieving the above object, the present invention also provides a kind of projector, comprises light source, point color element, mainboard and described light sensing system, wherein, the light that this light source sends projects on this mainboard through this point of color element, and this light sensing system is the light through this point of color element in order to sensing.
Preferably, this supply voltage converting unit and this control module are integrated on this mainboard, and this light sensing unit sensing is through the light of this point of color element.
Preferably, this light sensing unit is independent of this supply voltage converting unit.
Compared with prior art, a kind of light sensing system provided by the invention and projector, by the output voltage of control module received current voltage conversion unit, and regulate the change in resistance of variable resistor module according to this output voltage, by the adjusting of bias voltage having been improved to system light sensing ability, increased the dynamic range of output voltage, in this light sensing system, independently light sensing unit is convenient to be incorporated into the integration of optical engine system and ray machine module, improves the precision that Light Electrical is integrated.
Brief description of the drawings
Fig. 1 is the inner structure schematic diagram of a kind of Photosensing Units of prior art;
Fig. 2 is the structural representation of a kind of light sensing system of first embodiment of the invention;
The structural representation of a kind of light sensing system that Fig. 3 a and Fig. 3 b are second embodiment of the invention;
Fig. 4 is the structural representation of a kind of projector of third embodiment of the invention.
Embodiment
For making that object of the present invention, structure, feature and function thereof are had to further understanding, hereby coordinate embodiment to be described in detail as follows.
Shown in Fig. 2, disclose the structural representation of a kind of light sensing system of inventing the first embodiment, this light sensing system comprises light sensing unit 1, current/voltage converting unit 2 and control module 3.
Light sensing unit 1 sense ambient light generation current, this electric current changes with the variation of environment light frequency or intensity, and in the time of environment light frequency or intensity increase, the electric current producing increases thereupon.This light sensing unit 1 independently arranges with this current/voltage converting unit 2.In one embodiment, this light sensing unit 1 comprises light sensitive diode D1, and its negative pole is connected in this current/voltage converting unit 2, further, and the plus earth of this light sensitive diode D1.Wherein, this light sensitive diode D1 is independent of this current/voltage converting unit 2, is convenient to this photosensitive diode D1 to be integrated in separately optical engine system, and independently this sensitization diode D1 is convenient to integrate ray machine module, improves the precision of Light Electrical integration.
Current/voltage converting unit 2 connects this light sensing unit 1 and current conversion is become to voltage, this current/voltage converting unit 2 comprises variable resistor module 21 and operational amplifier 3, the inverting input a of this operational amplifier 3 connects this light sensing unit 1, and this variable resistor module 21 is connected between the inverting input a and output terminal c of this operational amplifier 3.Further, this current/voltage converting unit 2 comprises capacitor C 1, and this capacitor C 1 is in parallel with this variable resistor module 21, plays phase compensation, eliminates self-excitation and carry out the effect of burning voltage.Further, the normal phase input end b ground connection of this operational amplifier 3.
Control module 4 is connected in this current/voltage converting unit 2, and this control module 4 receives the output voltage V out of this current/voltage converting unit 2, and this control module 4 regulates the change in resistance of variable resistor module 21 according to this output voltage V out.Further, this control module 4 first predeterminated voltage that prestores, this control module 3 receives the first voltage of these current/voltage converting unit 2 output terminals, in the time that this first voltage is equal to or greater than this first predeterminated voltage, this control module 4 reduces the resistance of variable resistor module 21, until the output voltage of this current/voltage converting unit 2 is less than this first predeterminated voltage.Preferably, the prestore maximum output voltage of this current/voltage converting unit 2 of this control module 4, this control module 4 receives the first voltage of these current/voltage converting unit 2 output terminals, in the time that this first voltage equals this maximum output voltage, this control module 4 reduces the resistance of variable resistor module 21, reduces output voltage V out until this output voltage is less than maximum output voltage.Can realize when surround lighting frequency or the strength increase by reducing the resistance of variable resistor module 21, also can distinguish the illumination difference under this frequency or intensity, avoid occurring that because the output voltage of current/voltage converting unit 2 reaches capacity output voltage can not truly reflect the phenomenon of surround lighting frequency or Strength Changes.
Variable resistor module 21 is provided with multiple adjustable electric resistances, and this control module 4 is by controlling different resistance values access current/voltage converting unit 2.Further, variable resistor module 21 is in parallel or be composed in series by multiple resistance units, and control module 4 is realized the control to variable resistor module 21 place in circuit resistances by the switch of controlling resistance unit place in circuit, thereby distinguishes Different Light frequency or intensity.Preferably, this variable resistor module 21 can be slide rheostat.
In actual applications, this control module 4 can be microcontroller (MCU), the optional digital regulation resistance of variable resistor module 21 (Digital Potentiometer), this microcontroller changes the resistance of this digital regulation resistance by serial peripheral interface (SPI) or twin wire universal serial bus (I2C).
In one embodiment, this variable resistor module 21 is by 4 resistance R 1, R2, R3 and R4 parallel connection, R1=1M Ω, R2=1.6M Ω, R3=2.2M Ω, R4=2.8M Ω, the prestore maximum output voltage of this current/voltage converting unit 2 of this control module 4 is 2.5V, when system powers on, this control module 4 is controlled the R4 contactor closure of variable resistor module 21, for the initial value of this variable resistor module 21, now, R4 accesses in the circuit of this current/voltage converting unit 2, the resistance of this variable resistor module 21 is 2.8M Ω, in the time that light source frequency is A, the induction current that light irradiation sensing cell 1 produces is 0.5 μ A, output voltage is 1.4V,
In the time that light source frequency is B, the induction current that light irradiation sensing cell 1 produces is 1 μ A, output voltage is 2.5V, now, control module 4 detects output voltage and equals maximum output voltage 2.5V, and control module 4 controls that R4 contactor is opened and R3 contactor closure, and R3 accesses in the circuit of this current/voltage converting unit 2, the resistance of variable resistor module 21 is 2.2M Ω, and now output voltage is 2.2V;
In the time that light source frequency is C, the induction current that light irradiation sensing cell 1 produces is 1.5 μ A, output voltage is 2.5V, now, control module 4 detects output voltage and equals maximum output voltage 2.5V, reduce the resistance of this current/voltage converting unit 2 of access, this control module 4 controls that R4 contactor is opened and R3 contactor closure, R3 accesses in the circuit of this current/voltage converting unit 2, the resistance of this variable resistor module 21 is 2.2M Ω, now output voltage is still 2.5V, this control module 4 detects output voltage and equals maximum output voltage 2.5V, continue to reduce the resistance of this current/voltage converting unit 2 of access, this control module 4 controls that R3 contactor is opened and R2 contactor closure, R2 accesses in the circuit of this current/voltage converting unit 2, the resistance of this variable resistor module 21 is 1.6M Ω, now output voltage is 2.4V, this light sensing system, by above process difference output voltage, has been realized the differentiation to Different Light frequency A, B, C.
Shown in Fig. 3 a to Fig. 3 b, disclose the structural representation of a kind of light sensing system of inventing the second embodiment, be with the difference of the first embodiment shown in Fig. 1, light sensing unit 1' comprises light sensitive diode D1, current/voltage converting unit 2' comprises operational amplifier 3', the negative pole of this light sensitive diode D1 is connected in the inverting input a of this operational amplifier 3', positive pole is connected in the normal phase input end b of this operational amplifier 3', control module 4' connects the normal phase input end b with this operational amplifier 3', detect and adjust the positive bias voltage of this operational amplifier 3', change the zero-bit standard of output voltage, increase the dynamic range of system voltage output.Further, the positive pole of this light sensitive diode D1, is provided with a selector switch, and the positive pole of this switch control light sensitive diode D1 is optionally connected in normal phase input end b or the ground connection of this operational amplifier 3', to adapt to the needs of different system sensing function.
Shown in Fig. 4, disclosed the structural representation of a kind of projector of one embodiment of the invention, this projector comprises the light sensing system described in light source 5, point color element 6, mainboard 7 and previous embodiment, wherein, this point of color element 6 of light process that this light source 5 sends, then project on this mainboard 7.This supply voltage converting unit 2 " and this control module 4 " is integrated on this mainboard 7, this light sensing unit 1 " is independent of this supply voltage converting unit 2 ", be equipped with in optical-mechanical system, sensing is through the light of this point of color element 6, this light sensing system has solved Integrated Light sensing element volume and has been difficult for the problem of reducing, and improves the precision that Light Electrical is integrated.Further, this light sensing unit 1 " comprises light sensitive diode D1, this light sensitive diode D1 independence and supply voltage converting unit 2 ", further, this point of color element 6 is colour wheel, this colour wheel comprises rotary motor, the light that this light source 5 sends produces red through this colour wheel, blue, green three looks, this light sensing unit 1 " light of three kinds of different frequencies of sensing, and produce three kinds of different induction currents, this induction current is via current/voltage converting unit 2 " produces different voltage output, this control module 4 " is detected this difference voltage, and calculate the revolution speed of colour wheel according to the variation of voltage.Further, on mainboard 7, can be provided with digital micromirror elements DMD (Digital Micromirror Device), by three Colored light mixings together, and be converted to coloured image by Data Control, project on screen by projection lenses.The output voltage that this projector " receives this current/voltage converting unit 2 " by this control module 4, and regulate the change in resistance of this variable resistor module 21 according to this output voltage, by the adjusting of bias voltage having been improved to system light sensing ability, increase the dynamic range of output voltage, simultaneously, this photosensitive diode D1 is independent of this supply voltage converting unit 2 " to be arranged; be convenient to this photosensitive diode D1 to be integrated in separately optical engine system; independently this sensitization diode D1 is convenient to integrate ray machine module, improves the precision of Light Electrical integration.
The present invention is described by above-mentioned related embodiment, but above-described embodiment is only for implementing example of the present invention.Must be pointed out that, the embodiment having disclosed does not limit the scope of the invention.On the contrary, the change done without departing from the spirit and scope of the present invention and retouching, all belong to scope of patent protection of the present invention.
Claims (11)
1. a light sensing system, this light sensing system comprises light sensing unit and current/voltage converting unit, this light sensing unit sense ambient light generation current, this current/voltage converting unit connects this light sensing unit and current conversion is become to voltage, it is characterized in that, this current/voltage converting unit comprises variable resistor module, and this light sensing system also comprises:
Control module, is connected in this current/voltage converting unit;
Wherein, this control module receives the output voltage of this current/voltage converting unit, and this control module regulates the resistance of variable resistor module according to this output voltage.
2. a kind of light sensing system as claimed in claim 1, it is characterized in that, this control module one first predeterminated voltage that prestores, this control module receives the first voltage of this current/voltage converting unit output terminal, in the time that this first voltage is equal to or greater than this first predeterminated voltage, this control module reduces the resistance of variable resistor module.
3. a kind of light sensing system as claimed in claim 1, it is characterized in that, the prestore maximum output voltage of this current/voltage converting unit of this control module, this control module receives the first voltage of this current/voltage converting unit output terminal, in the time that this first voltage equals this maximum output voltage, this control module reduces the resistance of variable resistor module.
4. a kind of light sensing system as claimed in claim 1, it is characterized in that, this current/voltage converting unit also comprises operational amplifier, the inverting input of this operational amplifier connects this light sensing unit, and this variable resistor module is connected between the inverting input of this operational amplifier and the output terminal of this operational amplifier.
5. a kind of light sensing system as claimed in claim 4, is characterized in that, this light sensing unit comprises light sensitive diode, and the negative pole of this photosensitive diode is connected in the inverting input of this operational amplifier, its plus earth.
6. a kind of light sensing system as claimed in claim 4, it is characterized in that, this light sensing unit comprises light sensitive diode, and the negative pole of this photosensitive diode is connected in the inverting input of this operational amplifier, and its positive pole is optionally connected in the normal phase input end of this operational amplifier.
7. a kind of light sensing system as claimed in claim 4, is characterized in that, this control module connects the normal phase input end of this operational amplifier, for changing operational amplifier bias voltage.
8. a kind of light sensing system as claimed in claim 1, is characterized in that, this light sensing unit is independent of this supply voltage converting unit.
9. a projector, it is characterized in that, comprise the light sensing system described in light source, point color element, mainboard and claim 1-9 any one, wherein, the light that this light source sends projects on this mainboard through this point of color element, and this light sensing system is the light through this point of color element in order to sensing.
10. a kind of projector as claimed in claim 9, is characterized in that, this supply voltage converting unit and this control module are integrated on this mainboard, and this light sensing unit sensing is through the light of this point of color element.
11. a kind of projector as described in claim 9 or 10, is characterized in that, this light sensing unit is independent of this supply voltage converting unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410365897.8A CN104181759A (en) | 2014-07-29 | 2014-07-29 | Light sensing system and projector using same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410365897.8A CN104181759A (en) | 2014-07-29 | 2014-07-29 | Light sensing system and projector using same |
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| CN104181759A true CN104181759A (en) | 2014-12-03 |
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| CN201410365897.8A Pending CN104181759A (en) | 2014-07-29 | 2014-07-29 | Light sensing system and projector using same |
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| CN110398913A (en) * | 2018-04-25 | 2019-11-01 | 半导体组件工业公司 | For controlling the actuator control circuit and method of actuator |
| US11073422B2 (en) | 2019-03-05 | 2021-07-27 | Benq Intelligent Technology (Shanghai) Co., Ltd. | Projector and light detection circuit and light detection method thereof |
| TWI739070B (en) * | 2019-03-05 | 2021-09-11 | 明基電通股份有限公司 | Projector and the light detection circuit thereof |
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| TWI739070B (en) * | 2019-03-05 | 2021-09-11 | 明基電通股份有限公司 | Projector and the light detection circuit thereof |
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